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SubjectRe: [PATCH net-next 02/11] sfc: implement MCDI interface for vDPA operations
On Wed, Dec 7, 2022 at 10:56 PM Gautam Dawar <gautam.dawar@amd.com> wrote:
>
> Implement functions to perform vDPA operations like creating and
> removing virtqueues, getting doorbell register offset etc. using
> the MCDI interface with FW.
>
> Signed-off-by: Gautam Dawar <gautam.dawar@amd.com>
> ---
> drivers/net/ethernet/sfc/Kconfig | 8 +
> drivers/net/ethernet/sfc/Makefile | 1 +
> drivers/net/ethernet/sfc/ef100_vdpa.h | 32 +++
> drivers/net/ethernet/sfc/mcdi.h | 4 +
> drivers/net/ethernet/sfc/mcdi_vdpa.c | 268 ++++++++++++++++++++++++++
> drivers/net/ethernet/sfc/mcdi_vdpa.h | 84 ++++++++
> 6 files changed, 397 insertions(+)
> create mode 100644 drivers/net/ethernet/sfc/ef100_vdpa.h
> create mode 100644 drivers/net/ethernet/sfc/mcdi_vdpa.c
> create mode 100644 drivers/net/ethernet/sfc/mcdi_vdpa.h
>
> diff --git a/drivers/net/ethernet/sfc/Kconfig b/drivers/net/ethernet/sfc/Kconfig
> index 0950e6b0508f..1fa626c87d36 100644
> --- a/drivers/net/ethernet/sfc/Kconfig
> +++ b/drivers/net/ethernet/sfc/Kconfig
> @@ -63,6 +63,14 @@ config SFC_MCDI_LOGGING
> Driver-Interface) commands and responses, allowing debugging of
> driver/firmware interaction. The tracing is actually enabled by
> a sysfs file 'mcdi_logging' under the PCI device.
> +config SFC_VDPA
> + bool "Solarflare EF100-family VDPA support"
> + depends on SFC && VDPA && SFC_SRIOV
> + default y
> + help
> + This enables support for the virtio data path acceleration (vDPA).
> + vDPA device's datapath complies with the virtio specification,
> + but control path is vendor specific.
>
> source "drivers/net/ethernet/sfc/falcon/Kconfig"
> source "drivers/net/ethernet/sfc/siena/Kconfig"
> diff --git a/drivers/net/ethernet/sfc/Makefile b/drivers/net/ethernet/sfc/Makefile
> index 712a48d00069..059a0944e89a 100644
> --- a/drivers/net/ethernet/sfc/Makefile
> +++ b/drivers/net/ethernet/sfc/Makefile
> @@ -11,6 +11,7 @@ sfc-$(CONFIG_SFC_MTD) += mtd.o
> sfc-$(CONFIG_SFC_SRIOV) += sriov.o ef10_sriov.o ef100_sriov.o ef100_rep.o \
> mae.o tc.o tc_bindings.o tc_counters.o
>
> +sfc-$(CONFIG_SFC_VDPA) += mcdi_vdpa.o
> obj-$(CONFIG_SFC) += sfc.o
>
> obj-$(CONFIG_SFC_FALCON) += falcon/
> diff --git a/drivers/net/ethernet/sfc/ef100_vdpa.h b/drivers/net/ethernet/sfc/ef100_vdpa.h
> new file mode 100644
> index 000000000000..f6564448d0c7
> --- /dev/null
> +++ b/drivers/net/ethernet/sfc/ef100_vdpa.h
> @@ -0,0 +1,32 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/* Driver for Xilinx network controllers and boards
> + * Copyright (C) 2020-2022, Xilinx, Inc.
> + * Copyright (C) 2022, Advanced Micro Devices, Inc.
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms of the GNU General Public License version 2 as published
> + * by the Free Software Foundation, incorporated herein by reference.
> + */
> +
> +#ifndef __EF100_VDPA_H__
> +#define __EF100_VDPA_H__
> +
> +#include <linux/vdpa.h>
> +#include <uapi/linux/virtio_net.h>
> +#include "net_driver.h"
> +#include "ef100_nic.h"
> +
> +#if defined(CONFIG_SFC_VDPA)
> +
> +enum ef100_vdpa_device_type {
> + EF100_VDPA_DEVICE_TYPE_NET,
> +};
> +
> +enum ef100_vdpa_vq_type {
> + EF100_VDPA_VQ_TYPE_NET_RXQ,
> + EF100_VDPA_VQ_TYPE_NET_TXQ,
> + EF100_VDPA_VQ_NTYPES
> +};
> +
> +#endif /* CONFIG_SFC_VDPA */
> +#endif /* __EF100_VDPA_H__ */
> diff --git a/drivers/net/ethernet/sfc/mcdi.h b/drivers/net/ethernet/sfc/mcdi.h
> index 7e35fec9da35..db4ca4975ada 100644
> --- a/drivers/net/ethernet/sfc/mcdi.h
> +++ b/drivers/net/ethernet/sfc/mcdi.h
> @@ -214,6 +214,10 @@ void efx_mcdi_sensor_event(struct efx_nic *efx, efx_qword_t *ev);
> #define _MCDI_STRUCT_DWORD(_buf, _field) \
> ((_buf) + (_MCDI_CHECK_ALIGN(_field ## _OFST, 4) >> 2))
>
> +#define MCDI_SET_BYTE(_buf, _field, _value) do { \
> + BUILD_BUG_ON(MC_CMD_ ## _field ## _LEN != 1); \
> + *(u8 *)MCDI_PTR(_buf, _field) = _value; \
> + } while (0)
> #define MCDI_STRUCT_SET_BYTE(_buf, _field, _value) do { \
> BUILD_BUG_ON(_field ## _LEN != 1); \
> *(u8 *)MCDI_STRUCT_PTR(_buf, _field) = _value; \
> diff --git a/drivers/net/ethernet/sfc/mcdi_vdpa.c b/drivers/net/ethernet/sfc/mcdi_vdpa.c
> new file mode 100644
> index 000000000000..35f822170049
> --- /dev/null
> +++ b/drivers/net/ethernet/sfc/mcdi_vdpa.c
> @@ -0,0 +1,268 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/* Driver for Xilinx network controllers and boards
> + * Copyright (C) 2020-2022, Xilinx, Inc.
> + * Copyright (C) 2022, Advanced Micro Devices, Inc.
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms of the GNU General Public License version 2 as published
> + * by the Free Software Foundation, incorporated herein by reference.
> + */
> +
> +#include <linux/vdpa.h>
> +#include "ef100_vdpa.h"
> +#include "efx.h"
> +#include "nic.h"
> +#include "mcdi_vdpa.h"
> +#include "mcdi_pcol.h"
> +
> +/* The value of target_vf in virtio MC commands like
> + * virtqueue create, delete and get doorbell offset should
> + * contain the VF index when the calling function is a PF
> + * and VF_NULL (0xFFFF) otherwise. As the vDPA driver invokes
> + * MC commands in context of the VF, it uses VF_NULL.
> + */
> +#define MC_CMD_VIRTIO_TARGET_VF_NULL 0xFFFF
> +
> +struct efx_vring_ctx *efx_vdpa_vring_init(struct efx_nic *efx, u32 vi,
> + enum ef100_vdpa_vq_type vring_type)
> +{
> + struct efx_vring_ctx *vring_ctx;
> + u32 queue_cmd;
> +
> + vring_ctx = kzalloc(sizeof(*vring_ctx), GFP_KERNEL);
> + if (!vring_ctx)
> + return ERR_PTR(-ENOMEM);
> +
> + switch (vring_type) {
> + case EF100_VDPA_VQ_TYPE_NET_RXQ:
> + queue_cmd = MC_CMD_VIRTIO_INIT_QUEUE_REQ_NET_RXQ;
> + break;
> + case EF100_VDPA_VQ_TYPE_NET_TXQ:
> + queue_cmd = MC_CMD_VIRTIO_INIT_QUEUE_REQ_NET_TXQ;
> + break;
> + default:
> + pci_err(efx->pci_dev,
> + "%s: Invalid Queue type %u\n", __func__, vring_type);
> + kfree(vring_ctx);
> + return ERR_PTR(-ENOMEM);
> + }
> +
> + vring_ctx->efx = efx;
> + vring_ctx->vf_index = MC_CMD_VIRTIO_TARGET_VF_NULL;
> + vring_ctx->vi_index = vi;
> + vring_ctx->mcdi_vring_type = queue_cmd;
> + return vring_ctx;
> +}
> +
> +void efx_vdpa_vring_fini(struct efx_vring_ctx *vring_ctx)
> +{
> + kfree(vring_ctx);
> +}
> +
> +int efx_vdpa_get_features(struct efx_nic *efx,
> + enum ef100_vdpa_device_type type,
> + u64 *features)
> +{
> + MCDI_DECLARE_BUF(outbuf, MC_CMD_VIRTIO_GET_FEATURES_OUT_LEN);
> + MCDI_DECLARE_BUF(inbuf, MC_CMD_VIRTIO_GET_FEATURES_IN_LEN);
> + u32 high_val, low_val;
> + ssize_t outlen;
> + u32 dev_type;
> + int rc;
> +
> + if (!efx) {
> + pci_err(efx->pci_dev, "%s: Invalid NIC pointer\n", __func__);
> + return -EINVAL;
> + }
> + switch (type) {
> + case EF100_VDPA_DEVICE_TYPE_NET:
> + dev_type = MC_CMD_VIRTIO_GET_FEATURES_IN_NET;
> + break;
> + default:
> + pci_err(efx->pci_dev,
> + "%s: Device type %d not supported\n", __func__, type);
> + return -EINVAL;
> + }
> + MCDI_SET_DWORD(inbuf, VIRTIO_GET_FEATURES_IN_DEVICE_ID, dev_type);
> + rc = efx_mcdi_rpc(efx, MC_CMD_VIRTIO_GET_FEATURES, inbuf, sizeof(inbuf),
> + outbuf, sizeof(outbuf), &outlen);
> + if (rc)
> + return rc;
> + if (outlen < MC_CMD_VIRTIO_GET_FEATURES_OUT_LEN)
> + return -EIO;
> + low_val = MCDI_DWORD(outbuf, VIRTIO_GET_FEATURES_OUT_FEATURES_LO);
> + high_val = MCDI_DWORD(outbuf, VIRTIO_GET_FEATURES_OUT_FEATURES_HI);
> + *features = ((u64)high_val << 32) | low_val;
> + return 0;
> +}
> +
> +int efx_vdpa_verify_features(struct efx_nic *efx,
> + enum ef100_vdpa_device_type type, u64 features)
> +{
> + MCDI_DECLARE_BUF(inbuf, MC_CMD_VIRTIO_TEST_FEATURES_IN_LEN);
> + u32 dev_type;
> + int rc;
> +
> + BUILD_BUG_ON(MC_CMD_VIRTIO_TEST_FEATURES_OUT_LEN != 0);
> + switch (type) {
> + case EF100_VDPA_DEVICE_TYPE_NET:
> + dev_type = MC_CMD_VIRTIO_GET_FEATURES_IN_NET;
> + break;
> + default:
> + pci_err(efx->pci_dev,
> + "%s: Device type %d not supported\n", __func__, type);
> + return -EINVAL;
> + }
> + MCDI_SET_DWORD(inbuf, VIRTIO_TEST_FEATURES_IN_DEVICE_ID, dev_type);
> + MCDI_SET_DWORD(inbuf, VIRTIO_TEST_FEATURES_IN_FEATURES_LO, features);
> + MCDI_SET_DWORD(inbuf, VIRTIO_TEST_FEATURES_IN_FEATURES_HI,
> + features >> 32);
> + rc = efx_mcdi_rpc(efx, MC_CMD_VIRTIO_TEST_FEATURES, inbuf,
> + sizeof(inbuf), NULL, 0, NULL);
> + return rc;
> +}
> +
> +int efx_vdpa_vring_create(struct efx_vring_ctx *vring_ctx,
> + struct efx_vring_cfg *vring_cfg,
> + struct efx_vring_dyn_cfg *vring_dyn_cfg)
> +{
> + MCDI_DECLARE_BUF(inbuf, MC_CMD_VIRTIO_INIT_QUEUE_REQ_LEN);
> + struct efx_nic *efx = vring_ctx->efx;
> + int rc;
> +
> + BUILD_BUG_ON(MC_CMD_VIRTIO_INIT_QUEUE_RESP_LEN != 0);
> +
> + MCDI_SET_BYTE(inbuf, VIRTIO_INIT_QUEUE_REQ_QUEUE_TYPE,
> + vring_ctx->mcdi_vring_type);
> + MCDI_SET_WORD(inbuf, VIRTIO_INIT_QUEUE_REQ_TARGET_VF,
> + vring_ctx->vf_index);
> + MCDI_SET_DWORD(inbuf, VIRTIO_INIT_QUEUE_REQ_INSTANCE,
> + vring_ctx->vi_index);
> +
> + MCDI_SET_DWORD(inbuf, VIRTIO_INIT_QUEUE_REQ_SIZE, vring_cfg->size);
> + MCDI_SET_DWORD(inbuf, VIRTIO_INIT_QUEUE_REQ_DESC_TBL_ADDR_LO,
> + vring_cfg->desc);
> + MCDI_SET_DWORD(inbuf, VIRTIO_INIT_QUEUE_REQ_DESC_TBL_ADDR_HI,
> + vring_cfg->desc >> 32);
> + MCDI_SET_DWORD(inbuf, VIRTIO_INIT_QUEUE_REQ_AVAIL_RING_ADDR_LO,
> + vring_cfg->avail);
> + MCDI_SET_DWORD(inbuf, VIRTIO_INIT_QUEUE_REQ_AVAIL_RING_ADDR_HI,
> + vring_cfg->avail >> 32);
> + MCDI_SET_DWORD(inbuf, VIRTIO_INIT_QUEUE_REQ_USED_RING_ADDR_LO,
> + vring_cfg->used);
> + MCDI_SET_DWORD(inbuf, VIRTIO_INIT_QUEUE_REQ_USED_RING_ADDR_HI,
> + vring_cfg->used >> 32);
> + MCDI_SET_WORD(inbuf, VIRTIO_INIT_QUEUE_REQ_MSIX_VECTOR,
> + vring_cfg->msix_vector);
> + MCDI_SET_DWORD(inbuf, VIRTIO_INIT_QUEUE_REQ_FEATURES_LO,
> + vring_cfg->features);
> + MCDI_SET_DWORD(inbuf, VIRTIO_INIT_QUEUE_REQ_FEATURES_HI,
> + vring_cfg->features >> 32);
> +
> + if (vring_dyn_cfg) {
> + MCDI_SET_DWORD(inbuf, VIRTIO_INIT_QUEUE_REQ_INITIAL_PIDX,
> + vring_dyn_cfg->avail_idx);
> + MCDI_SET_DWORD(inbuf, VIRTIO_INIT_QUEUE_REQ_INITIAL_CIDX,
> + vring_dyn_cfg->used_idx);
> + }
> + MCDI_SET_DWORD(inbuf, VIRTIO_INIT_QUEUE_REQ_MPORT_SELECTOR,
> + MAE_MPORT_SELECTOR_ASSIGNED);
> +
> + rc = efx_mcdi_rpc(efx, MC_CMD_VIRTIO_INIT_QUEUE, inbuf, sizeof(inbuf),
> + NULL, 0, NULL);

It looks to me the mcdi_buffer belongs to the VF (allocated by the
calling of ef100_probe_vf()), I wonder how it is isolated from the DMA
that is initiated by userspace(guest)?

Thanks


> + return rc;
> +}
> +
> +int efx_vdpa_vring_destroy(struct efx_vring_ctx *vring_ctx,
> + struct efx_vring_dyn_cfg *vring_dyn_cfg)
> +{
> + MCDI_DECLARE_BUF(outbuf, MC_CMD_VIRTIO_FINI_QUEUE_RESP_LEN);
> + MCDI_DECLARE_BUF(inbuf, MC_CMD_VIRTIO_FINI_QUEUE_REQ_LEN);
> + struct efx_nic *efx = vring_ctx->efx;
> + ssize_t outlen;
> + int rc;
> +
> + MCDI_SET_BYTE(inbuf, VIRTIO_FINI_QUEUE_REQ_QUEUE_TYPE,
> + vring_ctx->mcdi_vring_type);
> + MCDI_SET_WORD(inbuf, VIRTIO_INIT_QUEUE_REQ_TARGET_VF,
> + vring_ctx->vf_index);
> + MCDI_SET_DWORD(inbuf, VIRTIO_INIT_QUEUE_REQ_INSTANCE,
> + vring_ctx->vi_index);
> + rc = efx_mcdi_rpc(efx, MC_CMD_VIRTIO_FINI_QUEUE, inbuf, sizeof(inbuf),
> + outbuf, sizeof(outbuf), &outlen);
> +
> + if (rc)
> + return rc;
> +
> + if (outlen < MC_CMD_VIRTIO_FINI_QUEUE_RESP_LEN)
> + return -EIO;
> +
> + if (vring_dyn_cfg) {
> + vring_dyn_cfg->avail_idx = MCDI_DWORD(outbuf,
> + VIRTIO_FINI_QUEUE_RESP_FINAL_PIDX);
> + vring_dyn_cfg->used_idx = MCDI_DWORD(outbuf,
> + VIRTIO_FINI_QUEUE_RESP_FINAL_CIDX);
> + }
> +
> + return 0;
> +}
> +
> +int efx_vdpa_get_doorbell_offset(struct efx_vring_ctx *vring_ctx,
> + u32 *offset)
> +{
> + MCDI_DECLARE_BUF(outbuf, MC_CMD_VIRTIO_GET_NET_DOORBELL_OFFSET_RESP_LEN);
> + MCDI_DECLARE_BUF(inbuf, MC_CMD_VIRTIO_GET_DOORBELL_OFFSET_REQ_LEN);
> + struct efx_nic *efx = vring_ctx->efx;
> + ssize_t outlen;
> + int rc;
> +
> + if (vring_ctx->mcdi_vring_type != MC_CMD_VIRTIO_INIT_QUEUE_REQ_NET_RXQ &&
> + vring_ctx->mcdi_vring_type != MC_CMD_VIRTIO_INIT_QUEUE_REQ_NET_TXQ) {
> + pci_err(efx->pci_dev,
> + "%s: Invalid Queue type %u\n",
> + __func__, vring_ctx->mcdi_vring_type);
> + return -EINVAL;
> + }
> +
> + MCDI_SET_BYTE(inbuf, VIRTIO_GET_DOORBELL_OFFSET_REQ_DEVICE_ID,
> + MC_CMD_VIRTIO_GET_FEATURES_IN_NET);
> + MCDI_SET_WORD(inbuf, VIRTIO_GET_DOORBELL_OFFSET_REQ_TARGET_VF,
> + vring_ctx->vf_index);
> + MCDI_SET_DWORD(inbuf, VIRTIO_GET_DOORBELL_OFFSET_REQ_INSTANCE,
> + vring_ctx->vi_index);
> +
> + rc = efx_mcdi_rpc(efx, MC_CMD_VIRTIO_GET_DOORBELL_OFFSET, inbuf,
> + sizeof(inbuf), outbuf, sizeof(outbuf), &outlen);
> + if (rc)
> + return rc;
> +
> + if (outlen < MC_CMD_VIRTIO_GET_NET_DOORBELL_OFFSET_RESP_LEN)
> + return -EIO;
> + if (vring_ctx->mcdi_vring_type == MC_CMD_VIRTIO_INIT_QUEUE_REQ_NET_RXQ)
> + *offset = MCDI_DWORD(outbuf,
> + VIRTIO_GET_NET_DOORBELL_OFFSET_RESP_RX_DBL_OFFSET);
> + else
> + *offset = MCDI_DWORD(outbuf,
> + VIRTIO_GET_NET_DOORBELL_OFFSET_RESP_TX_DBL_OFFSET);
> +
> + return 0;
> +}
> +
> +int efx_vdpa_get_mtu(struct efx_nic *efx, u16 *mtu)
> +{
> + MCDI_DECLARE_BUF(outbuf, MC_CMD_SET_MAC_V2_OUT_LEN);
> + MCDI_DECLARE_BUF(inbuf, MC_CMD_SET_MAC_EXT_IN_LEN);
> + ssize_t outlen;
> + int rc;
> +
> + MCDI_SET_DWORD(inbuf, SET_MAC_EXT_IN_CONTROL, 0);
> + rc = efx_mcdi_rpc(efx, MC_CMD_SET_MAC, inbuf, sizeof(inbuf),
> + outbuf, sizeof(outbuf), &outlen);
> + if (rc)
> + return rc;
> + if (outlen < MC_CMD_SET_MAC_V2_OUT_LEN)
> + return -EIO;
> +
> + *mtu = MCDI_DWORD(outbuf, SET_MAC_V2_OUT_MTU);
> + return 0;
> +}
> diff --git a/drivers/net/ethernet/sfc/mcdi_vdpa.h b/drivers/net/ethernet/sfc/mcdi_vdpa.h
> new file mode 100644
> index 000000000000..2a0f7c647c44
> --- /dev/null
> +++ b/drivers/net/ethernet/sfc/mcdi_vdpa.h
> @@ -0,0 +1,84 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/* Driver for Xilinx network controllers and boards
> + * Copyright (C) 2020-2022, Xilinx, Inc.
> + * Copyright (C) 2022, Advanced Micro Devices, Inc.
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms of the GNU General Public License version 2 as published
> + * by the Free Software Foundation, incorporated herein by reference.
> + */
> +
> +#ifndef EFX_MCDI_VDPA_H
> +#define EFX_MCDI_VDPA_H
> +
> +#if defined(CONFIG_SFC_VDPA)
> +#include "mcdi.h"
> +
> +/**
> + * struct efx_vring_ctx: The vring context
> + *
> + * @efx: pointer of the VF's efx_nic object
> + * @vf_index: VF index of the vDPA VF
> + * @vi_index: vi index to be used for queue creation
> + * @mcdi_vring_type: corresponding MCDI vring type
> + */
> +struct efx_vring_ctx {
> + struct efx_nic *efx;
> + u32 vf_index;
> + u32 vi_index;
> + u32 mcdi_vring_type;
> +};
> +
> +/**
> + * struct efx_vring_cfg: Configuration for vring creation
> + *
> + * @desc: Descriptor area address of the vring
> + * @avail: Available area address of the vring
> + * @used: Device area address of the vring
> + * @size: Queue size, in entries. Must be a power of two
> + * @msix_vector: msix vector address for the queue
> + * @features: negotiated feature bits
> + */
> +struct efx_vring_cfg {
> + u64 desc;
> + u64 avail;
> + u64 used;
> + u32 size;
> + u16 msix_vector;
> + u64 features;
> +};
> +
> +/**
> + * struct efx_vring_dyn_cfg - dynamic vring configuration
> + *
> + * @avail_idx: last available index of the vring
> + * @used_idx: last used index of the vring
> + */
> +struct efx_vring_dyn_cfg {
> + u32 avail_idx;
> + u32 used_idx;
> +};
> +
> +int efx_vdpa_get_features(struct efx_nic *efx, enum ef100_vdpa_device_type type,
> + u64 *featuresp);
> +
> +int efx_vdpa_verify_features(struct efx_nic *efx,
> + enum ef100_vdpa_device_type type, u64 features);
> +
> +struct efx_vring_ctx *efx_vdpa_vring_init(struct efx_nic *efx, u32 vi,
> + enum ef100_vdpa_vq_type vring_type);
> +
> +void efx_vdpa_vring_fini(struct efx_vring_ctx *vring_ctx);
> +
> +int efx_vdpa_vring_create(struct efx_vring_ctx *vring_ctx,
> + struct efx_vring_cfg *vring_cfg,
> + struct efx_vring_dyn_cfg *vring_dyn_cfg);
> +
> +int efx_vdpa_vring_destroy(struct efx_vring_ctx *vring_ctx,
> + struct efx_vring_dyn_cfg *vring_dyn_cfg);
> +
> +int efx_vdpa_get_doorbell_offset(struct efx_vring_ctx *vring_ctx,
> + u32 *offsetp);
> +int efx_vdpa_get_mtu(struct efx_nic *efx, u16 *mtu);
> +#endif
> +#endif
> --
> 2.30.1
>

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